Jack-o-lantern Mushroom (do NOT eat!)

They are probably Omphalotus illudens/ Jack O'Lantern, a toxic species sometimes confused with Chanterelles although quite easy to distinguish. They must be growing on the root of a tree, otherwise it is not O. illudens.

Nice example of how these grow in such big clusters. Thanks for using the Creative Commons license; I used this as an illustration for a post at The Natural Capital, with attribution and a link back to this page.